noun Chemistry.
the part of a liquid, especially an oil, remaining after its more soluble components have been extracted by a solvent.

1925–30; < French raffin(er) to refine (r(e)- re- + affiner to refine; see affine) + -ate1

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World English Dictionary
raffinate (ˈræfɪˌneɪt)
the liquid left after a solute has been extracted by solvent extraction
[C20: from French raffiner to refine + -ate1]

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American Heritage
Science Dictionary
raffinate   (rāf'ə-nāt')  Pronunciation Key 
The portion of an original liquid that remains after other components have been dissolved by a solvent. The term is often used to refer to the oil that is not dissolved in petroleum refining operations.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Raffinate was separated out and stored in open pits.
The raffinate is refortified with sulfuric acid and circulated back to the active leach areas.
In effect, the volume of raffinate flowing from the mill to the evaporation ponds will be disposed of via evaporation.
After contacting the aqueous solution with the organic extractant, the resulting extract and raffinate phases are separated.
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